What the LG DT501BKR0 costs to run
The LG DT501BKR0 is certified by ENERGY STAR at 526 kWh a year, one of the more expensive models in its category to run among dehumidifiers currently certified.
That $99 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
Efficient, or not, for a dehumidifier
The category average is 378 kWh/yr; this model runs 39.2% above it, ranking 497 of 546 dehumidifiers tracked here for running cost. That average is drawn from all 546 dehumidifiers ENERGY STAR currently certifies, not an outside number, a $28/year gap from this model at the national rate. Full sourcing is in the sourcing notes.
Right next to it on the list
A rank or two either side of the LG DT501BKR0: Hisense TLDH5026PW ($99/yr, 526 kWh/yr), then Mora MNDH50TP ($99/yr, 526 kWh/yr).
Same brand, different models
Of the 3 ENERGY STAR certified dehumidifiers LG makes, the DT501BKR0 costs the most to run, $41/year more than LG's cheapest, the DT251BWR0.
Lifespan
NAHB's Study of Life Expectancy of Home Components does not publish a figure for dehumidifiers, so no lifetime cost is shown here rather than a guessed one. The annual and monthly figures above stand on their own.
Is it worth replacing?
The LG DT501BKR0 runs above its category average. If the dehumidifier you actually own is older still, likely well past ENERGY STAR's efficiency baseline when it was made, a current certified model could cost meaningfully less than this model's $99/year every year.
Compare current ENERGY STAR certified dehumidifiers before buying.
If you're keeping it
The LG DT501BKR0 already costs $99/year to run; a repair bill on top of that is the kind of expense a protection plan exists to smooth out.
Where this number comes from
The full Dehumidifier category page shows all 546 dehumidifiers ranked by cost; the state-rate guide covers the half of this number that isn't the appliance. The 526 kWh/yr figure is ENERGY STAR's own certification, not a wattage estimate; exact dataset IDs are on the data sources page.